Conversion of alkycyclopentanes to aromatics

Abstract

A method is disclosed for the dehydroisomerization of alkylcyclopentanes using a catalyst comprising a large-pore zeolite, a Group VIII metal, and an alkaline earth metal.

What is claimed is: 
     
       1. A method of dehydroisomerization of alkylcyclopentanes to produce aromatics comprising contacting said alkylcyclopentanes under dehydroisomerization conditions with a catalyst comprising: (a) a large-pore zeolite;   (b) at least one Group VIII metal; and   (c) an alkaline earth metal selected from the group consisting of barium, strontium and calcium.   
     
     
       2. A method of dehydroisomerization of alkylcyclopentanes to produce aromatics according to claim 1 wherein said alkaline earth metal is barium and said Group VIII metal is platinum. 
     
     
       3. A method of dehydroisomerization of alkylcyclopentanes to produce aromatics according to claim 2 wherein said large-pore zeolite has an apparent pore size of from 7 to 9 Angstroms. 
     
     
       4. A method of dehydroisomerization of alkylcyclopentanes to produce aromatics according to claim 3 wherein said catalyst has from 0.1% to 5% by weight platinum and from 0.1% to 35% by weight barium. 
     
     
       5. A method of dehydroisomerization of alkylcyclopentanes to produce aromatics according to claim 4 wherein said large-pore zeolite is selected from the group consisting of zeolite X, zeolite Y and type L zeolite. 
     
     
       6. A method of dehydroisomerization of alkylcyclopentanes to produce aromatics according to claim 5 wherein said large-pore zeolite is zeolite Y. 
     
     
       7. A method of dehydroisomerization of alkylcyclopentanes to produce aromatics according to claim 5 wherein said large-pore zeolite is a type L zeolite. 
     
     
       8. A method of dehydroisomerization of alkylcyclopentanes to produce aromatics according to claim 7 wherein said catalyst has from 0.1% to 20% by weight barium. 
     
     
       9. A method of dehydroisomerization of alkylcyclopentanes to produce aromatics according to claim 8 wherein the majority of the crystals of said type L zeolite are larger than 500 Angstroms. 
     
     
       10. A method of dehydroisomerization of alkylcyclopentanes to produce aromatics according to claim 9 wherein the majority of the crystals of said type L zeolite are large than 1000 Angstroms. 
     
     
       11. A method of dehydroisomerization of alkylcyclopentanes to produce aromatics according to claim 10 wherein at least 80% of the crystals of said type L zeolite are larger than 1000 Angstroms. 
     
     
       12. A method of dehydroisomerization of alkylcyclopentanes to produce aromatics according to claim 11 wherein said catalyst comprises: (a) a type L zeolite containing from 0.1% to 1.5% by weight platinum and from 1% to 20% by weight barium; and   (b) an inorganic binder.   
     
     
       13. A method of dehydroisomerization of alkylcyclopentanes to produce aromatics according to claim 12 wherein said inorganic binder is selected from the group consisting of silica, alumina, and aluminosilicates. 
     
     
       14. A method of dehydroisomerization of alkylcyclopentanes to produce aromatics according to claim 8 wherein said contacting occurs at a temperature of from 800° to 1000° F.; an LHSV of from 0.1 to 20; a pressure of from 0 to 500 psig; and an H 2  /HC ratio of from 0 to 20. 
     
     
       15. A method of dehydroisomerization of alkylcyclopentanes to produce aromatics according to claim 14 wherein said contacting occurs at a temperature of from 820° to 950° F.; an LHSV of from 0.5 to 10; a pressure of from 1 atm., to 300 psig; and an H 2  /HC ratio of from 1 to 10.